The RF is not that stiff, by far not flexible, not extreme stiff, there are rackets on the market which are stiffer, fairly a lot.
There are many factors determining what it does on your arm, shoulder. Strings are a very important factor. But tension is important. Where is the sweet spot of the racket, are you hitting the ball into it. Does the racket match your playing style. Can you handle the weight. To low or to high, Balance.
And as always what is your tennis technique, how well are you trained.
But in general injuries happen way less with gut or multifibre.
Peter
Agreed it is not extreme stiff like a Pure Drive. Maybe I should have said pretty stiff.
Full poly just feels too stiff on it for me. Went back to gut/poly and not changing unless I change racquets.
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